I dont know anythign about the US Client, but in the EU/DE Client, the SData Files are Crypted :/
Got someone any Results with it?
I already tested a simple Deflate (Zip) with an possible Header from 0 Bytes until 100 Bytes, but no result :<

NpcSkills.SData and NpcQuest.SData questionTime to time thinking about that, best releases by lipro had decrypted files and has new decrypted Sacra map mobs and boses but NpcQuest.SData and...
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